Leather-graining machine



Ma 's, 1925.

- J. W. AULSON LEATHER GRAINING MACHINE Filed Dec.- 27, 1923 2 heets-Sheet 1 liwen lor: Jbhn V May 5, 1925.

' J. w. AULSON LEATHER GRAINING MACHINE Filed Dec. ,27, 1923 2 Sheets-Sheet '2 i Invenl'or.

?atented May 5, 1925.

- Z". JOHN WZ AULSONtOIE LYNN, MASSACHUSETTS.

\ LEALUHERrGRAINING' MACHINE.

Application filed December 27:, 1928.

useful Improvements in Leathr-Graining lilachineaof which the following is especification. V

This invention, relates to hide working machines and particularly tonne-chines of this characterwhich; are used to grain,

board, orsoftenhides and skins after-they have been tanned.

The present invention-hasfor its object the pi'o'vision'ofmeans for imparting a partial rotationto thehideiworking, dru-nrcombined with means for preventing ,its-rotationabout its. axis independent of the. actuating mechanism when it reaches'the extreme of its reciprocatory movement in' either direction.

The. invention consists primarily in securing to the drum shaft'a 'cam-zmemberand providing .atppposite endsofthe machine yielding .brake -members with which said cam member will coact to stop further rotation of the drum when it reaches eitherend of its movement in a horizontal" path.

, The invention further. consists in certain novel features of construction land-arrangement of parts which will be understood readily by reference to thedescription of the drawings and to the, claims to. beghereinafter given.

For the purpose of illustrating invention,

one preferred form thereof isillustrated in the drawings, this form'havingbeenfound to give satisfactory and reliable results although it is to be understood tliat-tlie-variions instrumentalitie's of which the inventionconsists can be variously arranged and or ganized and the invention.isnot'liinited to the precise arrangement and organization of these instrumentalities as herein shown and described except as required by theseope of i the appended claims.

in the drawings:

Figure 1 represents an elevation of a ma chine embodying the principle of the present invention.

Figure 2 represents a transverse sectionof the drum or working member,

Figure 3 represents a transverse vertical section ofthe machine showing the means for regulating the pressure. to be given to Serial No. 682,916.

the leather during the graining operation, and

l igure 4c represents a plan of said machine.

" SimiIar characters. indicate like parts thnoughoutthe several figures of the drawmg.

In: the drawings 1O areuprights at the front "and rear of a framework. The uprights lOon each side areoonnected bvbars 11,- ll 11, anda pair of. guide .menib ers 12 parallel to the bars 11 and spaced apart to receive thereciprocatingtbloc-ks 13 in which is revolubly mounted the: shaft let.

- 'llothe shaft 14 is securedaidrum15 having asemieyli'ndrieal periphery 16 covered with a sheet 17 ofrubber oiwsome similar gripping material.

' C Tlie shaft lethas mounted thereon at each end-a gear 18 freely revoluble thereon and onthe outer ends of said shaft 1%. are securedcam members 19. each "of which is provided w ith a shoulder 20.

The elevation of onlyone oamimember l9 and gear l8 are shown in the drawings, for convenience, it beingunderstood. that the gear, and cam member-on the left of the ma chine are similar to those shown. on the right of the machine. 7

Each gear 18 base pawl2l pivoted thereto at 22, said-pawl 2l-being retained in contact with the periphery of the cam .19 by -means of a spring22 ofany usual construc- -tion.

' Theteeth of the gear '18 on the right side ofthe machine meshwith the raclr 23. 'le the t-eethof the other gear 18mesh with the rack 24:, these racks being secured respectively to the right hand bar -11 and left hand bar 11" At the rear of the machine is a bracket 25 having bearings 26 for-the. driving; shaft 27 to the oppmsite ends of which A are secured the wheels 28.

Each wheel 28 has pivoted thereto at 29 one end of connecting rod 30, the opposite end of which has an opening therethrouggh in which is positioned an outer end of the shaft 14.

The shaft 27 is driven by anyisuitahle means such as'a belt (not shown) upon the pulley 31. As the shaft 27 rotates the connecting rod 30 will cause the blocks 13 to be reciprocated between the guides 12.

'lVhen the blocks 13 aremovedtoward the rear of the machine the right hand gear 18 will be rotated in the direction of the arrow a on Fig. 1, moving the pawl 21 away from the shoulder 20.

The engagement of the teeth of the gear 18 at the left of machine with the rack 241 will cause the pawl 21 on said gear to engage the shoulder 20 on the cam 19 adjacent thereto and move said cam 19 in the direction of the arrow Z) on Fig. 1.

The cams 19 being secured to the shaft 14: and the drum being also secured to said shaft 11 it is obvious that when the blocks 13 are reciprocating the drum 15 vill have a half revolution imparted thereto while said blocks are moving toward the rear of the machine and the rotation of said drum will be fully completed when the blocks 13 are moving in the opposite direction.

It is quite essential that the cam shoulders shall not move away from the pawls 21 when the drum 15 reaches the end of its movement in either direction and in order to accomplish this object suitable brake mechanism is provided for this purpose.

This brake mechanism consists of brackets 31, secured to the bars 11, 11 and having threaded rods 32 extending therefrom through brake straps 33 faced with strips 3-1 of leather or similar material capable of creating a friction.

The outer ends of the rods 32 have nuts 35 threaded thereto adapted to adjust the tension of the springs 36 surrounding said rods.

The rods 32 also having mounted thereon nuts or stop members 37 which limit the movement of the straps 33 toward the brackets 31.

The nuts 37 are adjusted on the rods 32 so that the straps 33 and leather strips 3-1 will be in such position that the cam 19 will contact with said leather strips just prior to the blocks 13 reaching the end of their movement in either direction.

As a consequence the rotary movement of each cam 19 will be retarded at the end of its reciprocatory movement and gradually stopped while the pawl 21 of one gear 18 is still in contact with the shoulder 20 of its cam 19.

lVhen this cam is stopped the other cam 19 will be in a position to permit the pawl 21 on the other gear 18 to immediately engage with the shoulder 20 of its cam member 19.

The result is that there is no lost movement and when one gear 18 reaches the end of its movement in one direction and has completed a half rotation of the drum 15 the pawl 21 on the other gear 18 will immediately engage the shoulder 20 of its cam and complete the rotation of the drum 15 as the various reciprocatory elements are moved in the opposite direction.

The hide to be operated upon is placed in folded condition upon the work supporting table 38 which has depending from the opposite ends thereof the members 39 into each of which is threaded a rod 10 the op posite end of which is threaded to a block pivotally mounted on one end of a lever 11 pivoted at 42 to a side bar 11 The rear ends of the front set of levers 11 are pivotally connected to front ends of the rear set of levers 11 by means of a member 413 having a downwardly extending ear pivotally connected to the treadle 4A- pivoted at 15 to the rear of the machine.

The front of the treadle 14 is provided with a footboard 16 by which the treadle 12 may be depressed thereby moving the levers 11 about their pivots and raising the table 38 bodily, the movement of said table 38 being the same at both ends thereby retaining the table horizontal and parallel with guides 12 under all conditions.

Above the table 38 are brackets 17 secured to the uprights 10 and having mounted therein the adjustable stop members 48.

By adjusting these members 18 the upward movement of the table may be regu lated so that the pressure upon the hide or skin may be varied at will. The table 38 has secured to its upper face a sheet 419 of rubber or some similar gripping material which will prevent movement of the lower fold of the hide or skin while the drum 15 is operating upon the upper fold of said hide.

Normally the hide support 38 is in the position indicated in Fig. 1 of the drawings, and when the drum 15 is at or near the rear end of the frame, the operator places a folded hide upon the gripping sheet 19, the fold or bight of the hide being toward the rear of the machine.

'When the drum reaches its forward position, the operator presses upon the foot board 16, moving the treadle 44 about the pivot 45, and thus forces the hide support 38 with the folded hide thereon upwardly against the drum 15 in which position the hide support 38 is retained until the drum in its reciprocation reaches its rearmost position.

As the drum 15 commences to rotate during its rear movement, the hidegripping sheet 17 thereon will grip upon the adjacent face of the hide and cause it to be moved toward the rear of the machine the lower layer of the hide being retained in position on the sheet 4:9 by the friction thereof. is a consequence of this movement the bight or fold of the hide will be moved toward the rear of the machine until the drum reaches its extreme rearward position.

The operator then removes his foot from the foot heard 6 of treadle L a d the h de support 38 will return, of its own weight, to its normal position.

The operator then seizes the hide and turns it over upon the support 38 and re peats the operation so that the other half of the hide will be treated in the same manner.

By pinching the bight or fold of the hide in this manner a grain will be formed all over the finish side of the hide.

If it is desired to produce a box effect upon the finish side of the hide, the hide will be folded again so that the fold will be at right angles to the fold previously described, and the two operations just mentioned will be repeated.

"When a pebbled or fancy effect is preferred, the operations of the hide may be carried still further with the hide folded at an angle to the folds hereinbefore re ferred to.

It must be understood that when, the hide is folded, the finish faces are always inside.

It is obvious therefore that by means of this machine any design may be given to the iinish faces of the hide which could be secured by hand operation and with less labor and in less time.

It is believed that the operation and many advantages of the invention will be understood readily without further description.

Having thus described my invention, I claim:

1. In a machine of the class described; a hide support; guides parallel with said support; a drum reciprocable on said guides; means for imparting a half revolution of said drum during its movement in one direction and completing the rotation during its movement in the opposite direction; and brake mechanism for stopping the rotation of the drum at a predetermined point at the end of its movement in either direction.

2. In a machine of the class described, a hide support; guides parallel with said support; a drum reciprocable on said guides; cam members rotatable with said drum provided with peripheral shoulders; gears rotatable about the axis of said cams; a pair of racks one above one gear and one below the other gear; pawls on said gears adapted to engage said shoulders; and brake mechanism for stopping the rotation of the drum at a predetermined point at the end of its reciprocating movement in either direction.

3. In a machine of the class described, a hide support; guides parallel with said support; a drum reciprocable on said guides; cam members rotatable with said drum provided with peripheral shoulders; gears rotatable about the axis of cams; a pair of racks one above one gear and one below the other gear; pawls on said gears adapted to engage said shoulders; and yielding straps adapted to engage said cams at the end of their reciprocatory movement in either direction and stop the rotation of said drum.

4. In a machine of the class described, a hide support; guides parallel with said sup port; a drum reciprocable on said guides; cam members rotatable with said drum provided with peripheral shoulders; gears rotatable about the axis of said cams; a pair of racks one above one gear and one below the other gear; pawls on said gears adapted to engage said shoulders; fixed brackets; rods mounted therein; brake straps supported by said rods and movable thereon; tension nuts threaded to said rods; springs on said rods between said straps and nuts; and stop members on said rods to limit the movement of said brake straps toward said brackets.

In a machine of the class described; a hide support; means for raising said hide support; guides parallel with said support; a drum reciprocable on said guides; means for imparting a half revolution of said drum during its movement in one direction and completing the rotation during its movement in the opposite dirction; and means for limiting the upward movement of said hide support.

6. In a machine of the class described including a reciprocating and rotating drum and mechanism for imparting rotary movement to said drum during its reciprocatory movement, means preventing the rotation of said drum independent of the rotating mechanism when said drum reaches the end of its reciprocatory movement in either direction.

7. In a machine of the class described ineluding a reciprocating and rotating drum and rotating mechanism therefor coacting with an element rotatable. with said drum, means adapted, at the end of the reciprocation of said drum in either direction, to engage said element and prevent its rotation independent of the other elements of said rotating mechanism.

8. In a machine of the class described including a reciprocating and rotating drum and rotating mechanism therefor carrying pawls; shouldered elements secured to the drum shaft and with which said pawls are.

adapted to coact; and means adapted, at the end of the reciprocation of said drum in either direction, to engage said elements and prevent the rotation of the drum independent of the pawls of said rotating mechanism.

Signed by me at 74.6 Old South Bldg, Boston, lilassachusetts, this 24th day of December, 1923.

JOHN N. AULSON. Witnesses ammi E. LOMBARD, NATHAN C. Loareann. 

